I believe the free-to-play version has less content. In comparison the the full game, which has like ten areas and a ton of items and quests, the free-to-play version has only about three areas (correct me if I'm mistaken) and a lot less gear that your minifig can acquire in-game.

I can't blame him. it really was pretty awesome. Had LU kept going for another few years, I would love to have seen what additions they would have made. I think that it should have had a bit more RPG-ish elements in it though. Still, the games was basically made for kids, so I could see the value in an easy-to-make-and-understand system.